Underswap Sans, ULCFan Wiki

Underswap is an AU where many of the characters' roles are swapped, as well as their personalities, though some quirks tend to stick in places, or are modified. Sans is the excitable, confident, extremely optimistic human hunter, while Papyrus is the laid back, protective bro following Chara

FW!UNDERSWAP SANS (OFFICIAL BIO), Wiki

Underswap and Fellswap - Sans and Frisk by WolfKIce on DeviantArt

Underswap Sans (Canon), Wiki

Underswap Sans (Canon), Wiki

UnderSwap:Captain Sans by Mettalicc on DeviantArt

UnderSwap Sans, Wiki

Sans, TS!Underswap Wiki

MH!Underswap, New Undertale Fanon AU Wiki

Underswap Sans, Undertale AU Characters Wiki

Sans, TS!Underswap Wiki